People keep spending additional units of a particular resource on a want until their marginal benefit is  decreasing withgreater thanless thannot affected by  their marginal cost.

Earthquake waves that vibrate from side to side and up and down only through solids are known as "seismic waves."hope my answer has you : )

Answerinflux;

When the indian plate collided with eurasian plate because it was cool 

Explosive eruptions are the most hazardous, involving large volumes of tephra and gases emitted from the volcano. lahars, pyroclastic flows, ashfall, and many other volcanic hazards are commonly associated with explosive eruptions. explosive eruptions are very dangerous. basically, any form of hazard can occur.